“I saw him last week, and he was clean and sober, his old self,” David Bar Katz told the New York Times. “I really thought this chapter was over.”

Hoffman, who was 46, was found with a syringe in his arm on the bathroom floor of his West Village apartment by his friend Sunday morning at about 11:30 a.m., and authorities believe he had been dead several hours, sources told NBC 4 New York.

Hoffman had been subletting the apartment where he was found dead. His longtime partner called Katz to check on him. He was supposed to meet his children at 9 a.m. The apartment was double locked, but Katz was able to enter with the help of an assistant.

Hoffman began acting in 1991 and acted in a range of films from Hunger Games to Boogie Nights. Click here for an overview of the Oscar winner's roles over the past two decades.